Denso 4192 Spark Plug

Denso 4192 U-Groove Spark Plug Overview

The Denso 4192 spark plug is a conventional ignition component built for stable secondary ignition performance and efficient combustion. Its U-Groove electrode design is engineered to improve ignitability, making it a direct-fit choice for classic Buick applications including the LeSabre and Skylark.

Compatible With 1967 Buick LeSabre and 1962-1967 Buick Skylark applications, this plug combines a copper center electrode core with nickel tip materials and a standard ground configuration for dependable spark delivery. The Denso 4192 is also a practical replacement for drivers searching for a Denso W16FPR-U cross-reference.

Key Features

• U-Groove ground electrode design for improved spark exposure
• 5000 ohm resistance for controlled ignition performance
• Copper center electrode core material for efficient conductivity
• Nickel center and ground electrode tip materials
• Standard ground configuration with a single ground electrode
• Pre-gapped to 0.7 mm
• Flat seat design with 14.00 mm thread diameter and 12.70 mm reach
• Manufacturer heat range 16

Detailed Description

Denso U-Groove Conventional spark plugs are built around a design that exposes the spark more effectively at the firing point, helping support cleaner ignition in older engine platforms. Part number 4192 uses a nickel-tipped ground electrode with a copper-core center electrode, a combination commonly selected for consistent spark transfer and reliable service in secondary ignition systems. For Buick LeSabre and Buick Skylark owners, Denso 4192 provides a straightforward OE-style replacement option that matches the listed fitment and specifications.

This part cross-references Denso Auto Parts W16FPR-U for the same application.

What It Helps Address

• Hard starting caused by worn or inconsistent spark plugs
• Misfire conditions related to weak ignition output
• Rough idle from degraded secondary ignition performance
• Reduced combustion efficiency from worn electrode surfaces
• Maintenance replacement for classic Buick ignition service

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range against the engine specification before installation. The Denso 4192 is pre-gapped to 0.7 mm, but the gap should still be checked during service to confirm it matches the engine requirement. Use proper torque procedures for a flat-seat spark plug and inspect ignition wires, cap, and coil condition at the same time to avoid repeat misfire concerns.

Quality Assurance

Denso manufactures ignition components to support consistent electrical performance and fitment accuracy. This spark plug is built with specified resistance, electrode materials, and dimensional details to align with the listed Buick applications and OE-style service expectations.